I have the imac Mac OS X 10.5.8. I don't have a router or a time capsule. I've been searching on the net for days on how to put a lock on my wifi. I opened an IP for my wifi through my airport express card to my Wii. Then I was able to use this connection for my iphone. My iphone shows no lock and my neighbor told me it came up without a lock on his kids laptop. The information I have found on how to lock it, discusses routers or the time capsule, or, it is for the mac not imac. Anyone know how to put a lock on the ip address I opened for my wifi connection? Thanks